Universität zu Köln

Magnhagen, Carin, Hellstrom, Gustav, Borcherding, Jost ORCID: 0000-0003-3411-5861 and Heynen, Martina (2012). Boldness in two perch populations - long-term differences and the effect of predation pressure. J. Anim. Ecol., 81 (6). S. 1311 - 1319. HOBOKEN: WILEY-BLACKWELL. ISSN 0021-8790

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Abstract

1. Populations of the same species often display different behaviours, for example, in their response to predators. The question is whether this difference is developed as part of a divergent selection caused by differences in predation pressure, or as a result of phenotypic responses to current environmental conditions. 2. Two populations of Eurasian perch were investigated over a time span of 6 years to see whether risk-taking behaviour in young-of-the-year perch were consistent across cohorts, or if behaviour varied over time with changes in predation regime. 3. Boldness was estimated in aquarium studies by looking at how the fish made trade-offs between foraging in a risky area and staying in shelter. Predation risk of each year and lake was estimated from fishing surveys, using an individual-based model calculating attack rates for cannibalistic perch. 4. The average boldness scores were consistently lower in perch from Fisksjon compared with those in Angersjon, although the magnitude of the difference varied among years. Variance component analyses showed that differences between lakes in boldness scores only explained 12 per cent of the total variation. Differences between years were contributing at least similarly or more to the total variance, and the variation was higher in Fisksjon than in Angersjon. 5. The observed risk-taking behaviour of young-of-the-year perch, compared across cohorts, was significantly correlated with the year-specific estimates of cannibalistic attack rates, with lower boldness scores in years with higher predation pressure. In Fisksjon, with significant changes over the years in population structure, the range of both predation risk and boldness scores was wider than in Angersjon. 6. By following the two perch populations over several years, we have been able to show that the differences in risk-taking behaviour mainly are due to direct phenotypic responses to recent experience of predation risk. Long-term differences in behaviour among perch populations thus reflect consistent differences in predation regime rather than diverging inherent traits.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Magnhagen, Carin UNSPECIFIED UNSPECIFIED UNSPECIFIED Hellstrom, Gustav UNSPECIFIED UNSPECIFIED UNSPECIFIED Borcherding, Jost UNSPECIFIED orcid.org/0000-0003-3411-5861 UNSPECIFIED Heynen, Martina UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-480065
DOI:	10.1111/j.1365-2656.2012.02007.x
Journal or Publication Title:	J. Anim. Ecol.
Volume:	81
Number:	6
Page Range:	S. 1311 - 1319
Date:	2012
Publisher:	WILEY-BLACKWELL
Place of Publication:	HOBOKEN
ISSN:	0021-8790
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language RISK-TAKING BEHAVIOR; THE-YEAR PERCH; ANTIPREDATOR BEHAVIOR; ANIMAL PERSONALITY; REALIZED HERITABILITY; AVIAN PERSONALITIES; NATURAL-SELECTION; DECISION-MAKING; EURASIAN PERCH; BODY DEPTH Multiple languages Ecology; Zoology Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/48006